<?xml version="1.0" encoding="UTF-8"?>

<Observation xmlns="http://hl7.org/fhir">
  <id value="date-lastmp"/>
  <status value="final"/>
  <category>
    <coding>
      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/>
      <code value="survey"/>
      <display value="Survey"/>
    </coding>
    <text value="AOE"/>
  </category>
  <code>
    <coding>
      <system value="http://loinc.org"/>
      <code value="8665-2"/>
      <display value="Last menstrual period start date"/>
    </coding>
    <text value="Last menstrual period start date"/>
  </code>
  <subject>
    <reference value="Patient/pat2"/>
  </subject>
  <effectiveDateTime value="2016-01-24"/>
  <valueDateTime value="2016-12-30"/>
</Observation>